Ion exchangeable glass with high compressive stress

摘要

An aluminosilicate glass article having a high compressive stress layer. The glass article comprises at least about 50 mol % SiO2 and at least about 11 mol % Na2O, and has a layer under a compressive stress of at least about 900 MPa and the depth of layer that extends at least about 30 μm from the surface of the glass article into the glass. A method of making such a glass article is also provided.

主权项

1. A glass article having a surface and a layer under compressive stress extending from the surface to a depth of layer wherein the compressive stress CS is at least about 900 Mpa and the depth of layer DOL is at least about 30 μm, wherein the glass article comprises:
at least about 50 mol % SiO2; from about 7 mol % to about 26 mol % Al2O3; from about 11 mol % to about 25 mol % Na2O; from 0 mol % to about 9 mol % B2O3; from 0 mol % to 2.5 mol % K2O; from 0 mol % to about 8.5 mol % MgO; and from 0 mol % to 1.5 mol % CaO; wherein the glass article exhibits a CS criterion defined by the equation −340+27.1*Al2O3−28.7*B2O3+15.6*Na2O−61.4*K2O+8.1*(MgO+ZnO)≧40 mol % and a compensation criterion defined by the equation 0.7 mol %≦Na2O+K2O−Al2O3−MgO−ZnO≦2 mol %.